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My cheap (but ever so comfortable) pair of gi trousers is wearing out at the knees. The reinforcement threads that form an 'x' on the knees have mostly gone and that's fine but one of the knees has what seems to be the start to a nice airing vent. The threads are still running across this small hole so it's not too bad..yet.

So how do people usually patch their gi trousers? Do you put a patch of white cloth on the inside? outside? or both? Or is there a fancier way of doing it? Tips on keeping the trousers intact after intense suwari-waza classes are also appreciated.

+ 1 on Pauliina. If you want to try and keep your pants still comfortable at the knee, use soft but thick cloth and saw it inside the pants. Reinforce on the wearing edges and saw the edge of the patch as well. If your patch is too small, it will start wearing out on the next weak part which would be the edge of the patch. Making a patch big enough to be outside the knee "rough" zone is one of the key to lasting repairs.